Dtg Pulse On The Base. Dynamic Rebalancing Loop Theory Research And Practice

The strapdown and attitude heading reference system (AHRS) equipped on the warships must rapidly go into and get out of combat readiness. So the DTG (dynamically tuned gyroscope) which is the key component of the strapdown AHRS must be able to set in motion and stop on time if necessary. The DTG being in free can't be set in motion and stop when the base of gyroscope is moving ,or else it may damage even break the DTG's flexure joint.For the above reasons mentioned, this dissertation concentrates on the study of theory and realization of pulse rebalance loop for DTG. Its major contents include.1. Based on a large number of study reports and patent literatures , the structural characteristics of analog and digital rebalance loop for DTG are analyzed, and some experiment results are summarized. The advantages and shortcomings of two loops are compared. The study of pulse rebalance loop is determined according to the DTG's structural characterization of the developing AHRS.2. Based on the dynamics equation of DTG , DTG's motion under start—stop case while it is on static base or moving base is analyzed . What may happen under the two case is described . The necessity that DTG must be controlled when it is set in motion and stop on moving base is discussed. Study on regular pattern of rotational speed changing and analysis on experiment result during the transition period of the rotor motion lay the theoretical and experimental foundation of a control unit for a design about DTG's start—stop on moving base.3. Based on analysis of DTG's coupling character , its decoupling control method is studied, and decoupling method of diagonal matrix isdetermined to be used in decoupling control of DTG's pulse rebalance loop. And how to achieve the data—out decoupling by a computer is discussed.4. Though the pulse rebalance loop has linear system feature, essentially it is a nonlinear sample control system , and it also has some nonlinear system feature , especially self — oscillation feature. For those reason, the self—oscillation is analyzed in detail with the aid of computer — aided analysis. The self — oscillation frequency ranges of a type I of system and a type H of system are discussed. The conclusion that linear — part of pulse rebalance loop must be a type I system is drawn.5. Base on the above analysis of theory, the functions of each unit of pulse rebalance loop is described and the key problems of design of each unit are discussed. A equivalent single loop is analyzed and designed. The method of start—stop control unit on moving base is accentuated. The data sample system for pulse rebalance loop is introduced. Finally, a pulse width — modulated loop for DTG with control decoupling and start —stop control is developed. After the loop is adjusted, analysis of the close loop frequency response shows it has well dynamic character, and the accuracy of torque current generator—the most important component of the loop is analyzed. Test and analysis of the loop show that the loop has satisfactory performance and realization of the expected aim, which lay a solid foundation for its engineering use.